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  1. CREATE FUNCTION hello (s TEXT CHARSET utf8)
  2. RETURNS TEXT CHARSET utf8 NO SQL
  3. RETURN CONCAT('Hello, ',s,'!');
  4.  
  5. SELECT hello('MĂĽller');
  6. -- [Error Code: 1366, SQL State: HY000]  Incorrect string value: '\xFCller' for column 's' at row 1